Rack enclosure



FIG. 1 is a front, top, and right side perspective view of a rack enclosure showing an embodiment of the present design;

FIG. 2 is a top elevational view thereof;

FIG. 3 is a back elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof; and,

FIG. 6 is a front side elevational view thereof. 

The ornamental design for a rack enclosure, as shown and described. 